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Java/strings/Palindrome.java at master · iDev-git/Java · GitHub
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Palindrome.java
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strings
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Palindrome.java
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package
strings
;
/** Wikipedia: https://en.wikipedia.org/wiki/Palindrome */
class
Palindrome
{
/** Driver Code */
public
static
void
main
(
String
[]
args
) {
String
[]
palindromes
= {
null
,
""
,
"aba"
,
"123321"
};
for
(
String
s
:
palindromes
) {
assert
isPalindrome
(
s
) &&
isPalindromeRecursion
(
s
) &&
isPalindrome1
(
s
);
}
String
[]
notPalindromes
= {
"abb"
,
"abc"
,
"abc123"
};
for
(
String
s
:
notPalindromes
) {
assert
!
isPalindrome
(
s
) && !
isPalindromeRecursion
(
s
) && !
isPalindrome1
(
s
);
}
}
/**
* Check if a string is palindrome string or not
*
* @param s a string to check
* @return {@code true} if given string is palindrome, otherwise {@code false}
*/
public
static
boolean
isPalindrome
(
String
s
) {
return
(
s
==
null
||
s
.
length
() <=
1
) ||
s
.
equals
(
new
StringBuilder
(
s
).
reverse
().
toString
());
}
/**
* Check if a string is palindrome string or not using recursion
*
* @param s a string to check
* @return {@code true} if given string is palindrome, otherwise {@code false}
*/
public
static
boolean
isPalindromeRecursion
(
String
s
) {
if
(
s
==
null
||
s
.
length
() <=
1
) {
return
true
;
}
if
(
s
.
charAt
(
0
) !=
s
.
charAt
(
s
.
length
() -
1
)) {
return
false
;
}
return
isPalindrome
(
s
.
substring
(
1
,
s
.
length
() -
1
));
}
/**
* Check if a string is palindrome string or not another way
*
* @param s a string to check
* @return {@code true} if given string is palindrome, otherwise {@code false}
*/
public
static
boolean
isPalindrome1
(
String
s
) {
if
(
s
==
null
||
s
.
length
() <=
1
) {
return
true
;
}
for
(
int
i
=
0
,
j
=
s
.
length
() -
1
;
i
<
j
; ++
i
, --
j
) {
if
(
s
.
charAt
(
i
) !=
s
.
charAt
(
j
)) {
return
false
;
}
}
return
true
;
}
}
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